Fingerprint



June 2, 1925.

1,540,680 A. E. BERGQUIST FINGER PRINT DETECTOR AND DEVELOPER Filed Dec. 26, 1925 Q 2 Sheets-Sheet l 0 g I 0 7" a ,75 7 i o a WITNIISS mvsmbn BY y I ATTORNEY Jim 2, 1925.

1,540,680 A. E. BERGQUIST FINGER PRINT DETECTOR AND' DEVELOPER 7 Filed Dec. 26, 1925 2 Sheets-Sheet 2 INVENTOR wrruzss ATTORNEY Patented June '2, '1925.

ARTHUR E. BER-semen or riivnsmc n vunnnso'rni rinenizrainrflnnrncToaAnn nave-norm.

Application-filed December 26,19235 i Sel m Ne. 682,81

To all whom it may concern":

Be it lmown that IARTHUR E.

ing at Lindstronn; in the county of Ghisago and State of! hlinnesota, have invented new and useful linproveinentsfl n l ingerprlnt Detectors and Developers,:of'which the fol- 7 lowing. is a specification y 1 Mypresent invention hasv t'o identification of Individuals by finger prints,

and it has foritsobject the provision "of a device tln'ougl1.t1re nie'diun i of which finger prints can be detected and developed in an exped i-tiousand thorouglrmanner. a v To the attainment of the "EOTEQOIHQ, the

invention consists in the improvement as hereinafter described and l definitely claimed.

In the accompanying drawings, formingpart of this specification i Figure 1--is a View illustratingthe face of the device constitutingithe Pl'BfBTTOdt einbodiinent of niyinvention. v

*Figu re 2 is a side elevation of the same. i

Figure'g is a longitudinal verticahsection of thedevicetaken inwthepl'ane indicated by the line 3+3ofFigure-1. 1

- Figure laisaiview similar to Figu re 3 but SllO'WlTIQ: a modification hereinafter exphcitly referred-t0. o Y i i Fg'ure 5- is a detaill'view hereinafter ex 7 plicitly refer red to.

Similar numerals designate corresponding parts in Figures li to 4: to which; reference will first be Ina-dc. I

ing 1, tapered towarch one end and havinga comparatively large and rounded opposite end 2 and alsohavingsanropening .3 in one side and extendingtthnough the magor portion of the length thereof: -'I he'sardcas1ng 1 is in thenature of a receptacle and in it.

are arranged two transverse shafts 4 and 5, the shaft 4 beingequippedlwath pulleys 6, 4

paratively large pulleys 7. On the said pulleys 6 and 7 are flexible belts 8 arranged in parallelism, which belts because of the" differences in size between the-pulleys 6 andthe pulleys 7 are arranged with their outerj stretches opposite and adjacent the opening 3 in the casing. The inner stretches of the.

belts S are as clearly shown arranged adja- .cent to the bottom wall 9 of thecasing. Carried by the belts and eXtendingtrans- Dunc Uis'r, a. citizeirof the United States, IBSlCL" do: witliithe fl'to engage-the inner sides of tlrerloute site end to the casing 1. *This' spriirg'l'i' and yielding -lio1d lZ'llO' Tollenlfiaga insti v theouterstretches'of the ibelts8'.-

are held outoff-operation by. a transvers Ainongotherelements the preferred 'e1n-. bodnnent of-my invention coinpnises a-case and the shaft 5 being equipped with com? versely:betweeni the seine-are slatsfltl on whioh are lips 11 Fined to the shaft-'31 and arranged: exterrorzly of the casing 1 is tar crank .12 through the inediun'nof which said shaft can beconven'iently rotateda for the movement 'of'the belts 8 and the: slats 110 thereon. Atl? in the casing is anlauxiliary transverse shaft on-f which is? arm :14 :fiXedl a to the shaft: 13 and carnyangad aceirt to itssw fre'ee-n'd comparatively short"transverse shaft "15 on which are rollers-"161 adapted:

stretches of the :& belts r 8: under -cond ti'ons hereinafter described. Aizcoiled sp :fi' surrounds -t hefa.uxi;liarysl r ft 113 and, con-a l nectedat one endthereto?airdatt ts adapted when the arin 212E isareleased to; press As shownqinzEignrcs:lrto-B', the-rollers 14L serves to ctlicctivelyzholdethe ""rollergliff in; 5

spaced=relationfto-tlre outer stretchesiof thc j I belts 811 t e V l 1 Under a special? condition hereinafter: reai a ferred [0 the rod 1*8 is reinovedi' asshowi i I in Figures =4 andr5 sot as to enable :the spring 17 to yieldinglypressitalic-"rollers 11.6 against 5 the inner'sides ofthe-belts 8;

In the practical use of'iny novelrfinger print 1 detector and: developer as 'illustrate'lil inlligures 1 to e theyreceptacleformed by 99 the casing *1 supplied with; a sufficient quantity of chen'iicals adapted :to adhere; to.)

the lines of a finger printandi hence bring. 1 the said lines out for identification purposes. The faceof'zth'e' device lfiithell131%LCGCLOVQ1K the finger printsand thecranlt '12 is turned. whereupon the chemicals willvbe picked: up,

' y "the cross. slatsi 10 as a said. slats pass: over the large pulleys, .andv thereafter the (llltmll cals will be thrown by thecross slats against 9 the brush against the surface.

lVhen it is necessary to use the device in an overhead position, as when a finger print occurs on a ceiling, the rod 18 is removed so as to enable the spring 17. to press the roller 16 in yielding manner against the inner sides of the outer stretches of the beltsS. Then the face of the casingi. e., the side thereof in which the opening 3 is provided, is held against the ceiling, and the crank 12 is rotated, when it will beseen that the cross rods 19 extending between the large pulleys 7 adjacent the peripheries thereof will serve by engaging the short portion of the arm or lever 14 to suddenly throw the roller 16 against the outer stretches of the belts' 8 at intervals. In other words the tappet rods 19 put the spring 17 under ten sion so that as each tappet rod 18 passes out of engagement with the arm orlever 14-, thespring 17 will quickly impel the rollers 16 against the outer stretches of the belt. In consequence of this at intervals portions of chemicals on the slats 1O will'be thrown against the surface bearing'the finger print so that the lines of the said print will be made perfectly clear. Manifestly the rod 18 is adapted to be expeditiously and easily removed and as readily replaced in the casing 1 according to the manner in which the device is to be employed. It will be understood from the foregoing that the device may be made in different sizes without in anyway affecting my invention, and it will be apparent from the foregoing that the device is simple and inexpensive in construction, is highly efficient in operation and is well adapted to withstand proper usage for an indefinite period of time.

I have entered into a detailed description of the construct-ion and relative arrangement of the parts embraced in the present and preferred embodiment of my invention in order to impart a full, clear and exact understanding of the said embodiment. I do not desire, however, to be understood as confining myself to the specific'construction and relative arrangement of parts inasmuch as in the future practice of the invention various changes and modificationsmaybe made such as fall Within the scope of my invention as defined in my appended claims.

Having described my invention, what I claim and desire to secure by Letters-Patent, is

1. A device for developing or making more prominent finger prints, comprising a casing adapted to contain a substance calculated to adh-ere'to the lines of a linger print and'render the same more readable, said casing having an opening for the pas sage therefrom of the said substance, and movable, manually-operable means in the casing for bringing about the movement of said substance from the interior of the easing to the print to be developed or made more prominent, the said casing being tapered toward one end and being provided with shafts and pulleys thereon, one of the pulleys being comparatively large, and the said pulleys being associated with abelt, and means on the beltvat intervals in the lengtlr thereof to take up chemicals and lated to adhere to the lines of a finger print and render the same more readable, said casing having an opening for the passage therefrom of the said substance, and movable,

manually-operable means in the casing for bringing about the movement of said substance from the interior of thecasing to the print to be developed or made more prominent, the said casing being tapered toward one end and being providedvwith shafts and pulleys thereon, one of the pulleys being comparatively large, and the said pulleys being associated with a belt, and means on the belt at intervals in the length thereof to take up chemicals and discharge the same through the opening in the casing, and the belt being associated with spring pressed tappet means to strike the inner side ofthe belt at, intervals, and the said tappet means being associated, in turn, with means on one of the pllleys forputting the spring under tension and suddenly releasing the same.

In testimony whereof I aflix my signature.

ARTHUR E. BERGQUIST.

.lOO 

